EP0634773A1 - Cathode ray tube - Google Patents
Cathode ray tube Download PDFInfo
- Publication number
- EP0634773A1 EP0634773A1 EP94201950A EP94201950A EP0634773A1 EP 0634773 A1 EP0634773 A1 EP 0634773A1 EP 94201950 A EP94201950 A EP 94201950A EP 94201950 A EP94201950 A EP 94201950A EP 0634773 A1 EP0634773 A1 EP 0634773A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrodes
- connecting elements
- cathode ray
- ray tube
- electron gun
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/48—Electron guns
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/82—Mounting, supporting, spacing, or insulating electron-optical or ion-optical arrangements
Definitions
- the invention relates to a cathode ray tube comprising a display screen and an electron gun having a means for generating electrons, a number of electrodes and a support which is composed of an insulating material, said electrodes being provided with connecting elements which are secured in the support.
- Cathode ray tubes are used, inter alia , in television receivers, computer monitors, oscilloscopes etc .
- a cathode ray tube of the class mentioned in the opening paragraph is of the conventional type.
- the electron gun comprises a means for generating electrons, for example a cathode.
- the electrodes are provided with connecting elements which are pressed into the support.
- the support is generally made from glass which can be softened.
- the electrodes of the electron gun are stacked on top of each other, whereafter the support is (or are, if more than one support is used) heated. By virtue thereof, the support and the projections can be interconnected. This is generally achieved by pressing the support against the projections. Since the glass has been softened by heating, the connecting elements can be inserted into the support.
- the connecting elements may be integral with the electrode or they may be secured to the electrode as a separate part. After cooling, the electrodes and the support are secured to each other.
- the cathode ray tube in accordance with the invention is characterized in that the electron gun comprises a pair of electrodes which are arranged one behind the other, said electrodes having connecting elements extending in a plane transverse to the electron beam, the width of the connecting elements of one of the electrodes of the pair of electrodes differing from the width of the connecting elements of the other electrode of the pair of electrodes.
- the connecting elements of successive electrodes are of equal width.
- the invention is inter alia based on the insight that electrons can readily hop from one electrode to a proximate electrode via a connecting element and to a connecting element of a nearby electrode via the support, and that in this process the edges of the connecting elements form an important source of electrons.
- the width of the connecting elements By varying the width of the connecting elements, the shortest distance, via the support, between the edge of a connecting element and the next electrode is increased.
- the cathode ray tube comprises means for applying voltages to the pair of electrodes, and the voltage applied to the electrode having the widest connecting elements is lower than the voltage applied to the electrode having the narrowest connecting elements.
- Fig. 1 is a partly perspective view of a cathode ray tube 1.
- Said cathode ray tube 1 comprises an evacuated envelope 2 having a display window 3, a cone 4 and a neck 5.
- an electron gun 6 for generating, in this example, three electron beams 7, 8 and 9.
- a luminescent display screen 10 which, in this example, comprises phosphor elements luminescing in red, green and blue is situated on the inside of the display window 3.
- the electron beams 7, 8 and 9 are deflected across the screen 10 by means of a deflection unit 11 which is located at the junction between the neck and the cone, and pass through the shadow mask 12 which comprises a thin plate having apertures 13.
- the electron beams 7, 8 and 9 pass through the apertures 13 at a small angle with respect to each other and each electron beam impinges on phosphor elements of only one colour.
- the means 14 for applying voltages to the electrodes of the electron gun are also diagrammatically shown.
- Fig. 2 is a diagrammatic, partly perspective view of an electron gun 6.
- Electron gun 6 comprises a common control electrode 21, also referred to as G1 electrode, in which three cathodes 22, 23 and 24 are secured.
- the G1 electrode is secured to supports 26 by means of connecting elements 25.
- Said supports are made of glass.
- An example of such supports are the supports which are commonly referred to as "beading rods".
- the electron gun 6 further comprises a common plate-shaped electrode 27, also referred to as G2 electrode, which is secured to the supports by connecting elements 28.
- the electron gun 6 comprises two supports 26. One of said supports is shown, the other is situated on the side of the electron gun 6 which is invisible in this perspective view.
- the electron gun 6 further comprises the common electrodes 29 and 31 which are also secured to supports 26 by means of connecting elements (30 and 32, respectively).
- the supports are secured on feed-through pins 35 by means of brackets 34. The electrical connections between the feed-through pins and the electrodes are not shown.
- Figs. 3A and 3B are side views of a detail of the electron gun 6. Electrodes 36 and 37 are secured in the support 26 by means of securing elements 38 and 39. Said securing elements 38 and 39 are shown in detail in Fig. 3B.
- the width of the securing element 39 exceeds that of securing element 38, for example 8 mm (securing element 39) and 5 mm (securing element 38).
- the distance between the electrodes (in the z-direction) is approximately 1.5 mm.
- the voltage applied to electrode 37 is lower than the voltage applied to electrode 36, during operation. Due to this, an electric field is generated between the electrodes. This electric field may cause electrons to hop from electrode 37 to electrode 36.
- FIG. 4 diagrammatically shows a detail of a further example of an electron gun for a cathode ray tube in accordance with the invention.
- This electron gun comprises a stack of 4 electrodes 41, 42, 43 and 44 having securing elements 41A, 42A, 43A and 44A, respectively.
- voltages V1 and V2 (V1 ⁇ V2) are applied to the electrodes, V1 being applied to electrodes 41 and 43 and V2 being applied to electrodes 42 and 44.
- the width of the connecting elements 41A and 43A is greater than the width of the connecting elements 42A and 44A.
- the widths are 8 mm (41A and 43A) and 5 mm (42A and 44A), respectively.
- the difference in width between the connecting elements is greater than the distance between the connecting elements, viewed along the electron beams.
- a further advantage is that sparking of the electron gun is enhanced.
- a customary step in the manufacture of an electron gun is the sparking of the electrodes. To this end, very high voltage differences between electrodes are generated. As a result, a flashover is generated between electrodes. By virtue thereof, burrs and loose particles are removed from the electrodes. Flashover between the connecting elements during sparking has two adverse effects. First, flashover between the electrodes does not take place or is less likely to take place and, second, loose particles can be formed. In a cathode ray tube in accordance with the invention, the risk of flashover between the connecting elements is reduced.
Landscapes
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Abstract
Description
- The invention relates to a cathode ray tube comprising a display screen and an electron gun having a means for generating electrons, a number of electrodes and a support which is composed of an insulating material, said electrodes being provided with connecting elements which are secured in the support.
- Cathode ray tubes are used, inter alia, in television receivers, computer monitors, oscilloscopes etc.
- A cathode ray tube of the class mentioned in the opening paragraph is of the conventional type. The electron gun comprises a means for generating electrons, for example a cathode. The electrodes are provided with connecting elements which are pressed into the support. The support is generally made from glass which can be softened. In the manufacture of the electron gun, the electrodes of the electron gun are stacked on top of each other, whereafter the support is (or are, if more than one support is used) heated. By virtue thereof, the support and the projections can be interconnected. This is generally achieved by pressing the support against the projections. Since the glass has been softened by heating, the connecting elements can be inserted into the support. The connecting elements may be integral with the electrode or they may be secured to the electrode as a separate part. After cooling, the electrodes and the support are secured to each other.
- In operation, voltages are applied to the electrodes. Due to said voltages, electro-optical fields are formed between the electrodes. The electrons generated are accelerated and focused by means of said electric fields. Ever higher demands are imposed on the quality of the electron-optical fields. As a result thereof, the number of electrodes in the electron gun and the value of the applied voltages increase. A problem which arises is that sometimes the electrodes themselves can generate electrons. These electrons may hop between the electrodes. Due to this, the cathode ray tube may be damaged, which leads to failure. Such electrons may also land on the display screen, thereby adversely affecting the contrast of the image displayed. These phenomena occur, in particular, at locations where high voltages are applied to the electrodes.
- It is an object of the invention to provide a cathode ray tube of the type mentioned in the opening paragraph, in which one or more than one of the above problems is reduced.
- To this end, the cathode ray tube in accordance with the invention is characterized in that the electron gun comprises a pair of electrodes which are arranged one behind the other, said electrodes having connecting elements extending in a plane transverse to the electron beam, the width of the connecting elements of one of the electrodes of the pair of electrodes differing from the width of the connecting elements of the other electrode of the pair of electrodes.
- Hopping of electrons between two electrodes can be reduced by varying the width of the connecting elements. In well-known electron guns, the connecting elements of successive electrodes are of equal width.
- The invention is inter alia based on the insight that electrons can readily hop from one electrode to a proximate electrode via a connecting element and to a connecting element of a nearby electrode via the support, and that in this process the edges of the connecting elements form an important source of electrons. By varying the width of the connecting elements, the shortest distance, via the support, between the edge of a connecting element and the next electrode is increased.
- In a preferred embodiment, the cathode ray tube comprises means for applying voltages to the pair of electrodes, and the voltage applied to the electrode having the widest connecting elements is lower than the voltage applied to the electrode having the narrowest connecting elements.
- In particular in this embodiment hopping of electrons is reduced.
- These and other aspects of the invention will be explained in greater detail by means of the accompanying drawing which shows a number of exemplary embodiments of the invention.
- In the drawing:
- Fig. 1 is a partly perspective view of a cathode ray tube;
- Fig. 2 is a partly perspective view of an electron gun;
- Figs. 3A and 3B are sectional views of a detail of an electron gun;
- Fig. 4 is a view of a detail of a further example of an electron gun.
- The Figures are diagrammatic. In the Figures, like parts generally bear like reference numerals.
- Fig. 1 is a partly perspective view of a
cathode ray tube 1. Saidcathode ray tube 1 comprises an evacuatedenvelope 2 having adisplay window 3, a cone 4 and aneck 5. In the neck there is provided anelectron gun 6 for generating, in this example, threeelectron beams 7, 8 and 9. Aluminescent display screen 10 which, in this example, comprises phosphor elements luminescing in red, green and blue is situated on the inside of thedisplay window 3. On their way to thescreen 10, theelectron beams 7, 8 and 9 are deflected across thescreen 10 by means of adeflection unit 11 which is located at the junction between the neck and the cone, and pass through theshadow mask 12 which comprises a thinplate having apertures 13. Theelectron beams 7, 8 and 9 pass through theapertures 13 at a small angle with respect to each other and each electron beam impinges on phosphor elements of only one colour. Themeans 14 for applying voltages to the electrodes of the electron gun are also diagrammatically shown. - Fig. 2 is a diagrammatic, partly perspective view of an
electron gun 6. Electrongun 6 comprises acommon control electrode 21, also referred to as G₁ electrode, in which threecathodes elements 25. Said supports are made of glass. An example of such supports are the supports which are commonly referred to as "beading rods". In this example, theelectron gun 6 further comprises a common plate-shaped electrode 27, also referred to as G₂ electrode, which is secured to the supports by connectingelements 28. In this example, theelectron gun 6 comprises twosupports 26. One of said supports is shown, the other is situated on the side of theelectron gun 6 which is invisible in this perspective view. Theelectron gun 6 further comprises thecommon electrodes pins 35 by means ofbrackets 34. The electrical connections between the feed-through pins and the electrodes are not shown. - Figs. 3A and 3B are side views of a detail of the
electron gun 6.Electrodes support 26 by means of securingelements elements securing element 39 exceeds that of securingelement 38, for example 8 mm (securing element 39) and 5 mm (securing element 38). The distance between the electrodes (in the z-direction) is approximately 1.5 mm. In this example, the voltage applied toelectrode 37 is lower than the voltage applied toelectrode 36, during operation. Due to this, an electric field is generated between the electrodes. This electric field may cause electrons to hop fromelectrode 37 toelectrode 36. This phenomenon, in which the electrons hop via thesupport 26, occurs in particular at the edges of the securingelements 39 ofelectrode 37. In cathode ray tubes in accordance with the invention, this distance is greater than the distance between the electrodes. In this example, the shortest distance between an edge of securingelement 39 andelectrode 36, via thesupport 26, is 2.1 mm, which is more than the distance between the electrodes (= 1.5 mm). This reduces the risk of electron hopping. Fig. 4 diagrammatically shows a detail of a further example of an electron gun for a cathode ray tube in accordance with the invention. This electron gun comprises a stack of 4electrodes securing elements electrodes electrodes elements elements - Since the likelihood of electrons hopping between the connecting elements is substantially reduced or absent, damage to the electron gun or contrast reduction does not occur or is reduced in a cathode ray tube in accordance with the invention. A further advantage is that sparking of the electron gun is enhanced. A customary step in the manufacture of an electron gun is the sparking of the electrodes. To this end, very high voltage differences between electrodes are generated. As a result, a flashover is generated between electrodes. By virtue thereof, burrs and loose particles are removed from the electrodes. Flashover between the connecting elements during sparking has two adverse effects. First, flashover between the electrodes does not take place or is less likely to take place and, second, loose particles can be formed. In a cathode ray tube in accordance with the invention, the risk of flashover between the connecting elements is reduced.
- It will be obvious that within the scope of the invention further variations are possible.
Claims (3)
- A cathode ray tube comprising a display screen and an electron gun having a means for generating electrons, a number of electrodes and a support which is composed of an insulating material, said electrodes being provided with connecting elements which are secured in the support, characterized in that the electron gun comprises a pair of electrodes which are arranged one behind the other, said electrodes having connecting elements extending in a plane transverse to the electron beam, the width of said connecting elements of one of the electrodes of the pair of electrodes differing from the width of the connecting elements of the other electrode of the pair of electrodes.
- A cathode ray tube as claimed in Claim 1, characterized in that the cathode ray tube comprises means for applying voltages to the pair of electrodes and in that, in operation, the voltage applied to the electrode having the widest connecting elements is lower than the voltage applied to the electrode having the narrowest connecting elements.
- A cathode ray tube as claimed in Claim 1 or 2, characterized in that the difference in width between the connecting elements is greater than the distance between the connecting elements, viewed along the supports.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE9300720A BE1007285A3 (en) | 1993-07-13 | 1993-07-13 | Cathode ray tube. |
BE9300720 | 1993-07-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0634773A1 true EP0634773A1 (en) | 1995-01-18 |
EP0634773B1 EP0634773B1 (en) | 1998-10-07 |
Family
ID=3887177
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94201950A Expired - Lifetime EP0634773B1 (en) | 1993-07-13 | 1994-07-06 | Cathode ray tube |
Country Status (6)
Country | Link |
---|---|
US (1) | US6653772B1 (en) |
EP (1) | EP0634773B1 (en) |
JP (1) | JP3735385B2 (en) |
KR (1) | KR100314690B1 (en) |
BE (1) | BE1007285A3 (en) |
DE (1) | DE69413755T2 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0104674A1 (en) * | 1982-08-25 | 1984-04-04 | Koninklijke Philips Electronics N.V. | Colour display tube |
FR2603135A1 (en) * | 1986-08-21 | 1988-02-26 | Sony Corp | ELECTRONIC GUN AND METHOD FOR ASSEMBLING SAME, APPLICABLE IN PARTICULAR TO THE MANUFACTURE OF TRICHROMIC CATHODE RAY TUBES WITH ONLINE GUNS |
US4990822A (en) * | 1989-12-29 | 1991-02-05 | Zenith Electronics Corporation | Focusing electrode assembly for a color cathode ray tube electron gun |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1097044B (en) * | 1959-11-24 | 1961-01-12 | Telefunken Gmbh | Electrode system for cathode ray tubes |
DE2526210A1 (en) * | 1975-06-12 | 1976-12-30 | Licentia Gmbh | Electrode for cathode ray colour tube with triple gun - has four electrodes welded to strip shaped brackets of interchangeable pairs |
US4096408A (en) * | 1976-01-28 | 1978-06-20 | Zenith Radio Corporation | Unitized in-line electron gun having stress-absorbing electrode supports |
CA1068323A (en) * | 1976-02-05 | 1979-12-18 | Horst H. Blumenberg | Unitized electron gun having electrodes with internal beam-shielding tubes |
US4137480A (en) * | 1977-03-31 | 1979-01-30 | Zenith Radio Corporation | Television picture tube with cathode coating erosion suppression |
US4181870A (en) * | 1978-03-08 | 1980-01-01 | Zenith Radio Corporation | Assembly of electron guns having different gamma values |
US4485327A (en) * | 1978-10-18 | 1984-11-27 | Hitachi, Ltd. | Color picture tube |
JPS56106352A (en) * | 1980-01-25 | 1981-08-24 | Hitachi Ltd | Electron gun frame for color picture tube |
NL8102527A (en) * | 1981-05-22 | 1982-12-16 | Philips Nv | COLOR IMAGE TUBE. |
JPS59148245A (en) * | 1983-02-15 | 1984-08-24 | Nec Corp | Electron gun electrode structure |
US4567400A (en) * | 1983-02-28 | 1986-01-28 | Rca Corporation | CRT Comprising metallized glass beads for suppressing arcing therein |
JPS60105050U (en) * | 1983-12-20 | 1985-07-17 | 三菱電機株式会社 | color picture tube |
US4595858A (en) * | 1984-12-03 | 1986-06-17 | Rca Corporation | Reinforcing means for a cup-shaped electron gun electrode |
US4818912A (en) * | 1988-03-15 | 1989-04-04 | Rca Licensing Corporation | CRT with arc suppressing means on insulating support rods |
JPH01255135A (en) * | 1988-04-01 | 1989-10-12 | Nec Corp | In-line type electron gun |
NL9000943A (en) * | 1990-04-20 | 1991-11-18 | Philips Nv | CATHODE JET TUBE WITH ELECTRON GUN. |
JPH0485557U (en) * | 1990-11-30 | 1992-07-24 | ||
DE69313399T2 (en) * | 1992-11-02 | 1998-02-26 | Philips Electronics Nv | Vacuum tube with ceramic part |
-
1993
- 1993-07-13 BE BE9300720A patent/BE1007285A3/en not_active IP Right Cessation
-
1994
- 1994-07-06 EP EP94201950A patent/EP0634773B1/en not_active Expired - Lifetime
- 1994-07-06 DE DE69413755T patent/DE69413755T2/en not_active Expired - Fee Related
- 1994-07-11 JP JP15863994A patent/JP3735385B2/en not_active Expired - Fee Related
- 1994-07-12 US US08/273,672 patent/US6653772B1/en not_active Expired - Fee Related
- 1994-07-12 KR KR1019940016687A patent/KR100314690B1/en not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0104674A1 (en) * | 1982-08-25 | 1984-04-04 | Koninklijke Philips Electronics N.V. | Colour display tube |
FR2603135A1 (en) * | 1986-08-21 | 1988-02-26 | Sony Corp | ELECTRONIC GUN AND METHOD FOR ASSEMBLING SAME, APPLICABLE IN PARTICULAR TO THE MANUFACTURE OF TRICHROMIC CATHODE RAY TUBES WITH ONLINE GUNS |
US4990822A (en) * | 1989-12-29 | 1991-02-05 | Zenith Electronics Corporation | Focusing electrode assembly for a color cathode ray tube electron gun |
Also Published As
Publication number | Publication date |
---|---|
JP3735385B2 (en) | 2006-01-18 |
EP0634773B1 (en) | 1998-10-07 |
BE1007285A3 (en) | 1995-05-09 |
US6653772B1 (en) | 2003-11-25 |
KR960015677A (en) | 1996-05-22 |
JPH0757656A (en) | 1995-03-03 |
DE69413755T2 (en) | 1999-05-20 |
KR100314690B1 (en) | 2002-04-06 |
DE69413755D1 (en) | 1998-11-12 |
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